How to overcome fear to jump?Remember to start low to the ground as well. It will allow you to be less afraid of the ground, and work on your technique. Eventually, however, you will have to just stand up and fall until you realize that you have trained yourself to be relatively safe

Drills for reducing your natural “flinch” reactionIm fairly certain i've been "trained" to flinch as well, from a night job and a bored boss and a couple years. I think its sounding like I just need to get someone to do the same thing to me as they did with you.